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1. theta = tan^-1(x/D)

2. wsintheta = nlambda

3. dsintheta = nlambda

Which order m of in the two-slit interference pattern will give the least uncertainty in the slit spacing, d?

a) m = 1 b) m = 2 c) m = 3 d) largest m available e) smallest m available

For a two-slit interference pattern, if the width of each slit is made 20% smaller, what is the change in

the angle of the first interference maximum?

a) 40% decrease b) 20% increase c) 40% increase d) 20% decrease e) no change

For an illuminated pair of slits, if the spacing between the slits is made 20% smaller, what is the change

in the angle of the first diffraction minimum?

a) 40% decrease b) 20% increase c) 40% increase d) 20% decrease e) no change

Can anyone explain how I would do these?

Thanks!